Thrombus removal catheter and thrombus removal device

Abstract

The invention discloses a thrombus removing catheter and a thrombus removing device, and belongs to the technical field of medical instruments. The invention discloses a thrombus removing catheter and a thrombus removing device. The thrombus removing catheter comprises a sleeve, a negative pressure tube, a cutting assembly and a blocking net assembly. The negative pressure pipe is embedded in the sleeve, and the negative pressure pipe and the sleeve are coaxially arranged; a suction port is formed in the negative pressure tube, and the suction port is communicated with the interior of the negative pressure tube so as to suck cut thrombus fragments out of a body; the cutting assembly comprises a cutting pipe and a cutting mechanism; the cutting pipe is nested in the negative pressure pipe, and the cutting pipe and the negative pressure pipe are in relative sliding connection; the cutting mechanism is used for penetrating and cutting thrombus; the blocking net assembly is arranged behind the cutting assembly and comprises a blocking net, a blocking net barrel, a blocking net pipe, a limiting column, a first expansion ring, a connecting rod and a second expansion ring. Thrombus fragments can be prevented from escaping, and the blood vessel wall can be efficiently cleaned in the single movement process.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and more specifically, relates to a thrombus removal catheter and a thrombus removal device. Background Technology

[0002] A thrombus is a blood clot formed when formed elements such as red blood cells, platelets, fibrin, and white blood cells aggregate abnormally in different proportions within a blood vessel under pathological conditions secondary to the intrinsic or extrinsic coagulation system. Thrombus formation causes vascular occlusion and obstructed blood flow, and in severe cases, can lead to symptoms of corresponding organ dysfunction. For small thrombi, thrombolysis is a suitable treatment method, but the treatment effect is not ideal for large thrombi that cause occlusion, and physical cutting is required for removal. Existing thrombus removal devices, such as the patent document with application number CN202011353749.6 (application date November 27, 2020), disclose a thrombus and cholesterol deposit removal device with a human hand-like grasping function. It separates the thrombus blade plug and the rear of the thrombus claw from the storage bucket. The thrombus blade cover is supported, and with the first and second support rods, the support effect is better, ensuring the cleaning effect. The grasping device grasps and slowly approaches the thrombus blade, which rotates and cuts. The thrombus processor brush head, which is fixedly connected to the surface of the front claw of the thrombus claw, cleans the thrombus or cholesterol deposits, ensuring the cleaning effect. However, it has at least the following drawbacks: 1. During the thrombus cutting process, thrombus fragments cannot be collected in time, and scattered fragments may escape and flow to the distal end of the blood vessel; 2. The brush head needs to move back and forth for cleaning. If the brush head is too close to the blood vessel wall, it may cause damage to the blood vessel due to scraping; if the brush head is too far from the blood vessel, it cannot remove the thrombus attached to the blood vessel wall. Therefore, a thrombus removal catheter and thrombus removal device that can prevent thrombus fragments from escaping and can efficiently clean the blood vessel wall in a single movement is needed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a thrombus removal catheter and a thrombus removal device, which can prevent thrombus fragments from escaping and can efficiently clean the blood vessel wall in a single movement.

[0004] The present invention provides a thrombus removal catheter and a thrombus removal device, which includes a sleeve, a negative pressure tube, a cutting assembly, and a baffle assembly; The negative pressure tube is embedded inside the sleeve and is coaxial with the sleeve; the negative pressure tube has a suction port that is connected to the inside of the negative pressure tube to suction the cut thrombus fragments to the outside of the body. The cutting assembly includes a cutting tube and a cutting mechanism; the cutting tube is nested inside the negative pressure tube, and the cutting tube and the negative pressure tube are slidably connected; the cutting mechanism is used to penetrate and cut the thrombus. The baffle assembly is installed after the cutting assembly. The baffle assembly includes a baffle net, a baffle cylinder, a baffle tube, a limiting post, a first expansion ring, a connecting rod, and a second expansion ring. The baffle cylinder is connected to the cutting tube. The baffle cylinder has a hollow structure to accommodate the baffle tube. The baffle cylinder has symmetrically arranged grooves on its upper and lower sides, extending along its length and communicating with the baffle cylinder. The limiting post is fixedly installed on the outer side of the baffle tube and slidably connected to the groove. The first expansion ring is fixedly installed on the outer side of the limiting post, and the connecting rod is fixedly installed on the side of the first expansion ring away from the cutting tube. One end of the connecting rod is connected to the first expansion ring, and the other end is connected to the inner wall of the second expansion ring. The baffle net is arranged around the outer side of the baffle cylinder, and the first and second expansion rings are used to expand the baffle net outwards.

[0005] As a further improvement of the present invention, a punch is fixedly provided on the end of the baffle tube away from the cutting component; the punch protrudes outward from the baffle tube and faces the thrombus side; the punch includes at least one tip, the tip face forms an acute angle with the horizontal plane, and the punch is used to break the interior of the thrombus.

[0006] As a further improvement of the present invention, the size of the first expansion ring is larger than the outer diameter of the baffle cylinder, and the first expansion ring is wrapped around the outside of the baffle cylinder; the first expansion ring partially penetrates the limiting posts on the upper and lower sides; the outer diameter of the second expansion ring is larger than the outer diameter of the first expansion ring, and a chamfer is provided on the side of the second expansion ring closer to the first expansion ring; the edge of the opening at one end of the baffle is fixedly connected to the outer side of the baffle cylinder, and an opening is provided at the end of the baffle away from the cutting tube.

[0007] As a further improvement of the present invention, a side blade is provided at the end of the baffle away from the cutting tube; the inner wall of the side blade is fixedly connected to the outer surface of the baffle cylinder, the side blade is made of rigid material, and at least part of the side blade is in contact with the thrombus inside the blood vessel, for cleaning the thrombus attached to the inside of the blood vessel.

[0008] As a further improvement of the present invention, when the baffle assembly is in the retracted state, the first expansion ring is located on the side of the baffle tube away from the cutting tube and is also located on the inner side of the baffle; the second expansion ring is located on the outer side of the baffle; when the baffle assembly is in the extended state, both the first and second expansion rings are located on the inner side of the baffle, and the outer walls of the first and second expansion rings abut against the inner wall of the baffle to expand the baffle outward; after the baffle is expanded, its outer diameter is at least equal to the outer diameter of the inner wall of the blood vessel; during the thrombus breaking process, the cutting tube and the baffle tube move axially synchronously.

[0009] As a further improvement of the present invention, the cutting mechanism includes an opening cylinder; the opening cylinder is fixedly sleeved on the outside of the cutting tube, and the opening cylinder protrudes outward along the radial direction of the cutting tube; the opening cylinder has a plurality of insertion grooves on the side facing the far end of the cutting tube, the plurality of insertion grooves are evenly arranged around the opening cylinder in the circumferential direction, and the opening direction of the insertion grooves faces the far end of the cutting tube, so that the groove surface of the insertion groove and the end face of the opening cylinder form a stepped surface.

[0010] As a further improvement of the present invention, the cutting mechanism also includes a mesh sleeve; the mesh sleeve is fixedly installed on the side of the cutting tube away from the negative pressure tube, and is used to embed and firmly grasp the inside of the uncut thrombus; the mesh sleeve is composed of several alloy wires, which are evenly and circumferentially arranged on the outside of the cutting tube, and the two ends of the alloy wires are respectively connected to the outer side of the cutting tube and the end face of the perforated tube. With the axis of the cutting tube as the central axis, the two ends of the alloy wires are close to the connection, and the middle section arches outward to form a spindle shape.

[0011] As a further improvement of the present invention, the alloy wire material is a nickel-titanium alloy material with shape memory effect; the alloy wire is bonded to the cutting tube and the perforated tube by bonding or hot-melt welding.

[0012] As a further improvement of the present invention, the cutting mechanism includes a cutting blade; the cutting blade is disposed on the side of the perforated cylinder away from the negative pressure tube, and the cutting blade is spirally arranged around the outside of the cutting tube. When the cutting tube moves outward axially, the cutting blade cuts the thrombus.

[0013] A thrombus removal device includes a thrombus removal catheter and a negative pressure device; one end of the negative pressure catheter away from the suction port is connected to the output end of an external negative pressure device; the negative pressure device is a negative pressure syringe or a negative pressure pump, used to extract broken thrombi.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting up a baffle assembly, when thrombus fragments need to be broken, the baffle tube moves axially, driving the limiting post and the first expansion ring to move axially along the slide groove. The second expansion ring and the first expansion ring cooperate to expand the baffle outward until the outer side of the baffle abuts against the inner wall of the blood vessel. The expanded baffle matches the diameter of the blood vessel to prevent the thrombus from escaping outward. The broken and cut thrombus is blocked by the baffle, and the thrombus can only move towards the negative pressure tube side. The inner wall of the blood vessel can be cleaned during the cutting process, improving the overall cleaning efficiency. It can both prevent the escape of thrombus fragments and efficiently clean the blood vessel wall in a single movement.

[0015] 2. By setting up a punch, an opening tube, and a mesh sleeve; the moving punch is used to penetrate the thrombus, the opening tube assists in penetrating the thrombus, facilitating the movement and positioning of the catheter to form a passage for the thrombus catheter to pass through; the end of the mesh sleeve near the cutting tube is located outside the thrombus that needs to be broken and is in a retracted state, while the mesh sleeve is used to embed and hold the uncut thrombus inside; it can achieve a good penetration effect on hard thrombi. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the barrier assembly of the present invention in a retracted state; Figure 3 This is a schematic diagram of the barrier assembly of the present invention in an extended state; Figure 4 This is a schematic diagram of the sliding operation of the baffle tube within the baffle cylinder according to the present invention; Figure 5 This is a schematic diagram of the structure of the baffle tube of the present invention; Figure 6 This is a schematic diagram of the cutting assembly and the baffle cylinder of the present invention.

[0017] Explanation of the labels in the diagram: Sleeve 1; Negative pressure tube 2, suction port 21; Cutting assembly 3, cutting tube 31, mesh sleeve 32, perforated tube 33, insertion groove 331, cutting blade 34; Net assembly 4, net 41, side blade 411, net cylinder 42, slide groove 421, net tube 43, punch 431, limiting post 44, first extension ring 45, connecting rod 46, second extension ring 47; Detailed Implementation

[0018] Specific Implementation Example 1: Please refer to Figures 1-6 A thrombus removal catheter includes a sleeve 1, a negative pressure tube 2, a cutting assembly 3, and a baffle assembly 4.

[0019] The negative pressure tube 2 is embedded within the sleeve 1, and is coaxially arranged with the sleeve 1, with the negative pressure tube 2 located at one end of the sleeve 1. A suction port 21 is provided on the negative pressure tube 2, and the suction port 21 is connected to the interior of the negative pressure tube 2. The suction port 21 is located on the outside of the sleeve 1 and is used to conduct negative pressure to the thrombus area to suction the cut thrombus fragments to the outside of the body. In this embodiment, the negative pressure tube 2 can be detachably or fixedly connected to the sleeve 1.

[0020] The cutting assembly 3 includes a cutting tube 31, a mesh sleeve 32, an opening cylinder 33, and a cutting blade 34. The mesh sleeve 32, the opening cylinder 33, and the cutting blade 34 constitute the cutting mechanism. A through hole runs through the negative pressure tube 2 in a front-to-back direction. The cutting tube 31 is nested within the negative pressure tube 2, and the cutting tube 31 and the negative pressure tube 2 are slidably connected. The end of the cutting tube 31 closer to the negative pressure tube 2 is the proximal end, and the end of the cutting tube 31 farther from the negative pressure tube 2 is the distal end. The mesh sleeve 32 is fixedly disposed on the side of the cutting tube 31 away from the negative pressure tube 2, and is used to embed and firmly grasp the uncut thrombus. The mesh sleeve 32 is composed of several alloy wires, which are evenly and circumferentially arranged on the outside of the cutting tube 31. The two ends of the alloy wires are connected to the outer surface of the cutting tube 31 and the end face of the opening cylinder 33, respectively. With the axis of the cutting tube 31 as the central axis, the two ends of the alloy wires are tightly attached to the connection points, and the middle section arches outward to form a spindle shape. The outer diameter of the mesh 32 is smaller than the inner diameter of the applicable blood vessel. Preferably, the alloy wire material is a nickel-titanium alloy material with shape memory effect, so that the mesh 32 has a certain elasticity; the alloy wire is bonded to the cutting tube 31 and the perforated tube 33 by adhesive bonding or hot-melt welding.

[0021] The cutting tube 31 has a hollow structure. The far end of the cutting tube 31 is connected to the output end of an external motor to drive the cutting tube 31 to move axially. The motor is a conventional motor, and its connection with the cutting tube 31 is a conventional technical means. The specific connection relationship and working principle will not be described here.

[0022] The perforated tube 33 is fixedly disposed on the side of the sleeve 32 away from the negative pressure tube 2. The perforated tube 33 is fixedly sleeved on the outside of the cutting tube 31, protruding radially outward along the cutting tube 31. Several insertion grooves 331 are formed on the side of the perforated tube 33 facing the distal end of the cutting tube 31. These grooves are evenly distributed circumferentially around the perforated tube 33, with their openings facing the distal end of the cutting tube 31, so that the groove surface of the insertion groove 331 and the end face of the perforated tube 33 form a stepped surface. The outer diameter of the perforated tube 33 is smaller than the inner diameter of the applicable blood vessel. When the perforated tube 33 is inserted into the thrombus, it is used to protrude outward from inside the thrombus, facilitating the movement and positioning of the catheter.

[0023] The cutting blade 34 is located on the side of the perforated tube 33 away from the negative pressure tube 2. The cutting blade 34 is spirally arranged around the outside of the cutting tube 31. When the cutting tube 31 moves outward axially, the cutting blade 34 cuts the thrombus.

[0024] The baffle assembly 4 is positioned after the cutting assembly 3. The baffle assembly 4 includes a baffle 41, a baffle cylinder 42, a baffle tube 43, a limiting post 44, a first extension ring 45, a connecting rod 46, and a second extension ring 47. The baffle cylinder 42 is located at the distal end of the cutting tube 31 and is connected to the cutting tube 31. The baffle cylinder 42 has a hollow structure to accommodate the baffle tube 43. The baffle cylinder 42 has symmetrically arranged grooves 421 on its upper and lower sides, extending along its length and communicating with the baffle cylinder 42. The baffle tube 43 is coaxially arranged with the cutting tube 31 and the baffle cylinder 42. The limiting post 44 is fixedly arranged on the outside of the baffle tube 43. The limiting post 44 protrudes outward from the baffle tube 43. There are two limiting posts 44, which are symmetrically arranged on both sides of the baffle tube 43. The limiting post 44 is embedded in the sliding groove 421 and is slidably connected to the sliding groove 421.

[0025] A punch 431 is fixedly provided on one end of the baffle tube 43 away from the cutting component 3. The punch 431 protrudes outward from the baffle tube 43 and faces the thrombus side. The punch 431 includes at least one tip, and the tip face forms an acute angle with the horizontal plane. The punch 431 is used to break the inside of the thrombus.

[0026] The first expansion ring 45 and the second expansion ring 47 are used to expand the baffle 41 outward. The first expansion ring 45 is fixedly disposed on the outside of the limiting post 44, and the size of the first expansion ring 45 is larger than the outer diameter of the baffle cylinder 42. The first expansion ring 45 surrounds the outside of the baffle cylinder 42. The first expansion ring 45 partially penetrates the limiting posts 44 on both the upper and lower sides. The connecting rod 46 is fixedly disposed on the side of the first expansion ring 45 away from the cutting tube 31. The connecting rod 46 is horizontally disposed along the length of the baffle cylinder 42 and extends to the distal end. The position of the connecting rod 46 is 90° away from the limiting post 44. One end of the connecting rod 46 is connected to the first expansion ring 45, and the other end is connected to the inner wall of the second expansion ring 47. In this embodiment, there are two connecting rods 46, which are symmetrically disposed on both sides of the first expansion ring 45, located on the outside of the baffle cylinder 42. The outer diameter of the second expansion ring 47 is larger than that of the first expansion ring 45. A chamfer is provided on the side of the second expansion ring 47 near the first expansion ring 45 so that the second expansion ring 47 can enter the baffle 41.

[0027] A baffle 41 is arranged around the outside of the baffle cylinder 42. The edge of the opening at one end of the baffle 41 is fixedly connected to the outer surface of the baffle cylinder 42. The end of the baffle 41 away from the cutting tube 31 has an opening. The baffle 41 is made of an elastic material and has a tendency to expand outward under internal force. A side blade 411 is provided at the end of the baffle 41 away from the cutting tube 31. The inner wall of the side blade 411 is fixedly connected to the outer surface of the baffle cylinder 42. The side blade 411 is made of a rigid material, and at least part of the side blade 411 is in contact with the thrombus inside the blood vessel to clear the thrombus attached to the blood vessel. When the baffle assembly 4 is in the retracted state, the first expansion ring 45 is located on the side of the baffle cylinder 42 away from the cutting tube 31 and is also located on the inner side of the baffle 41; the second expansion ring 47 is located on the outer side of the baffle 41.

[0028] When the baffle assembly 4 is in the extended state, both the first extending ring 45 and the second extending ring 47 are located inside the baffle 41, and the outer walls of the first extending ring 45 and the second extending ring 47 abut against the inner wall of the baffle 41 to expand the baffle 41 outward. After the baffle 41 is expanded, its outer diameter is at least equal to the outer diameter of the blood vessel inner wall. During the thrombus fragmentation process, the cutting tube 31 and the baffle tube 43 move axially synchronously.

[0029] Specific Embodiment Two: A thrombus removal device is also provided, which includes any of the thrombus removal catheters described above, and a negative pressure device. The end of the negative pressure tube 2 away from the suction port 21 is connected to the output end of an external negative pressure device. For example, the negative pressure device can be a negative pressure syringe or a negative pressure pump, used to extract broken thrombi.

[0030] Working principle: Using a puncture needle, a puncture is performed at a suitable site on the patient to insert a thrombus catheter into the body. The thrombus catheter passes through the thrombus and moves to the baffle tube 42, which is located on the outer side of the distal end of the thrombus. During the movement, the punch 43 is used to penetrate the thrombus, and the perforated tube 33 assists in penetrating the thrombus, facilitating the movement and positioning of the catheter to form a passage for the thrombus catheter to pass through. The end of the baffle tube 41 near the cutting tube 31 is located on the outer side of the thrombus to be broken and is in a retracted state. The sleeve 32 is used to embed and hold the uncut thrombus inside. When the thrombus is to be broken, the baffle tube 43 moves axially, driving the limiting post 44 and the first expansion ring 45 to move axially along the groove 421. The second expansion ring 47 and the first expansion ring 45 cooperate to open the baffle tube 41 outward until the outer side of the baffle tube 41 abuts against the inner wall of the blood vessel to prevent the broken thrombus fragments from escaping to the outer end. When breaking up a thrombus, the external motor drives the cutting tube 31 to move axially, and the cutting blade 34 cuts the thrombus during the movement. The cutting tube 31 and the baffle tube 43 move axially synchronously to prevent thrombus fragments from escaping, while the side blade 411 moves accordingly to clear thrombi attached to the inside of the blood vessel.

Claims

1. A thrombectomy catheter, comprising: It includes sleeve (1), negative pressure pipe (2), cutting assembly (3) and screen assembly (4); The negative pressure pipe (2) is embedded in the sleeve (1), and the negative pressure pipe (2) is coaxially arranged with the sleeve (1); the negative pressure pipe (2) is provided with a suction port (21), and the suction port (21) is communicated with the inside of the negative pressure pipe (2) to suck the thrombus fragments cut to the outside of the body; The cutting assembly (3) includes a cutting pipe (31) and a cutting mechanism; the cutting pipe (31) is nested in the negative pressure pipe (2), and the cutting pipe (31) and the negative pressure pipe (2) are relatively slidably connected; the cutting mechanism is used for penetrating and cutting thrombus; The screen assembly (4) is arranged in the rear sequence of the cutting assembly (3), and the screen assembly (4) includes a screen (41), a screen cylinder (42), a screen pipe (43), a limiting column (44), a first expansion ring (45), a connecting rod (46), and a second expansion ring (47); the screen cylinder (42) is connected between the cutting pipe (31); the screen cylinder (42) is a hollow structure to accommodate the screen pipe (43); the screen cylinder (42) is symmetrically provided with a sliding groove (421) on the upper side and the lower side, respectively; the sliding groove (421) is provided along the length direction of the screen cylinder (42), and the sliding groove (421) and the screen cylinder (42) are mutually penetrated; the limiting column (44) is fixedly arranged on the outer side of the screen pipe (43), and the limiting column (44) is slidably connected with the sliding groove (421); the first expansion ring (45) is fixedly arranged on the outer side of the limiting column (44), the connecting rod (46) is fixedly arranged on the side of the first expansion ring (45) away from the cutting pipe (31), one end of the connecting rod (46) is connected with the first expansion ring (45), and the other end is connected with the inner side wall of the second expansion ring (47); the screen (41) is arranged around the outer side of the screen cylinder (42), and the first expansion ring (45) and the second expansion ring (47) are used for expanding the screen (41) outward.

2. The thrombectomy catheter of claim 1, wherein: The screen pipe (43) is fixedly provided with a punch (431) on the end away from the cutting assembly (3); the punch (431) protrudes outward of the screen pipe (43), the punch (431) faces the thrombus side, and the punch (431) at least includes a sharp end, the sharp end face and the horizontal plane form an acute angle, and the punch (431) is used for breaking the inside of the thrombus.

3. The thrombectomy catheter of claim 1, wherein: The size of the first expansion ring (45) is greater than the outer diameter of the screen cylinder (42), and the first expansion ring (45) is arranged around the outer side of the screen cylinder (42); the first expansion ring (45) partially penetrates the limiting column (44) on the upper side and the lower side; the outer diameter of the second expansion ring (47) is greater than the outer diameter of the first expansion ring (45), and the second expansion ring (47) is provided with a chamfer on the side close to the first expansion ring (45); the edge of the opening at one end of the screen (41) is fixedly connected with the outer side of the screen cylinder (42), and the end of the screen (41) away from the cutting pipe (31) is provided with an opening.

4. The thrombectomy catheter of claim 1, wherein: The side blade (411) is arranged at one end of the cutting tube (31) away from the blocking net (41); the inner wall of the side blade (411) is fixedly connected with the outer side of the blocking net barrel (42); the side blade (411) is made of rigid material; at least part of the side blade (411) is in contact with the thrombus inside the blood vessel, and is used for cleaning the thrombus attached to the inside of the blood vessel.

5. The thrombectomy catheter of claim 1, wherein: When the blocking net assembly (4) is in the contracted state, the first expansion ring (45) is located on the side of the blocking net barrel (42) away from the cutting tube (31), and is located on the inner side of the blocking net (41); the second expansion ring (47) is located on the outer side of the blocking net (41); when the blocking net assembly (4) is in the expanded state, the first expansion ring (45) and the second expansion ring (47) are located on the inner side of the blocking net (41); the outer walls of the first expansion ring (45) and the second expansion ring (47) abut against the inner wall of the blocking net (41) to expand the blocking net (41) outward; after the expansion of the blocking net (41), the outer diameter of the blocking net (41) is at least equal to the outer diameter of the inner wall of the blood vessel; during the crushing of the thrombus, the cutting tube (31) and the blocking net tube (43) move synchronously in the axial direction.

6. The thrombectomy catheter of claim 1, wherein: The cutting mechanism comprises a perforated barrel (33); the perforated barrel (33) is fixedly arranged on the outer side of the cutting tube (31), and the perforated barrel (33) protrudes outward along the radial direction of the cutting tube (31); a plurality of insertion grooves (331) are arranged on the perforated barrel (33) towards the distal end of the cutting tube (31); the plurality of insertion grooves (331) are evenly arranged in the circumferential direction around the perforated barrel (33); the opening direction of the insertion grooves (331) is towards the distal end of the cutting tube (31), so that a stepped surface is formed between the groove surface of the insertion grooves (331) and the end surface of the perforated barrel (33).

7. The thrombectomy catheter of claim 6, wherein: The cutting mechanism further comprises a sleeve net (32); the sleeve net (32) is fixedly arranged on the side of the cutting tube (31) away from the negative pressure tube (2), and is used for embedding and holding the uncut thrombus inside; the sleeve net (32) is composed of a plurality of alloy wires; the alloy wires are evenly arranged in the circumferential direction on the outer side of the cutting tube (31); the two ends of the alloy wires are connected with the outer side of the cutting tube (31) and the end surface of the perforated barrel (33) respectively; the alloy wires are tightly attached to the connection positions with the cutting tube (31) as the central axis; the middle part of the alloy wires is arched outward; and the alloy wires are woven into a spindle shape.

8. The thrombectomy catheter of claim 7, wherein: The alloy wire material is a nickel-titanium alloy material with shape memory effect; the alloy wire is connected with the cutting tube (31) and the perforated barrel (33) by adhesion or hot melt welding.

9. The thrombectomy catheter of claim 6, wherein: The cutting mechanism comprises a cutting blade (34); the cutting blade (34) is arranged on the side of the perforated barrel (33) away from the negative pressure tube (2); the cutting blade (34) is spirally arranged on the outer side of the cutting tube (31); when the cutting tube (31) moves axially outward, the cutting blade (34) cuts the thrombus.

10. A thrombectomy device, comprising: The thrombus removal catheter comprises the thrombus removal catheter according to any one of claims 1 to 9, and a negative pressure device; one end of the negative pressure tube (2) away from the suction port (21) is connected with the output end of the external negative pressure device; the negative pressure device is a negative pressure syringe or a negative pressure pump, and is used for sucking out the crushed thrombus.

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